Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32ea10fd006827e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 23:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c8d3761343bf7032a73a20817fe29429 SHA-1: a5a69d8869ae1c04bb7ded03cbc2cebebc7a4677 SHA-256: d32ea10fd006827e545ec14fa01b291f265fe2a7b1966519ecfa1f649202efeb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to unknown or potentially malicious domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and heuristics point towards a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://serka.com/serka/upload/files/litadazibuzasunoki.pdf In PDF document text
    • https://carrieres-pierre.com/userfiles/file/63965987182.pdfIn PDF document text
    • https://quasar.mago.ro/ckfinder/userfiles/files/soniwe.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/28009568380.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210909005242771.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/mategig.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613195dbcc16c---41014260803.pdfIn PDF document text
    • http://topflexsports.com/uploads/20854329236.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/4968571630.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210904005500.pdfIn PDF document text
    • https://ottopianos.nl/files/sevazeviniranesiru.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/woluxuwofofedijajebenijak.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/17413525449.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/navuju.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/58012551270.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/dutolokimasedes.pdfIn PDF document text
    • http://orrizon.ru/images/file/17008311223.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/wokiwaseja.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109021824599469.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/58833047488.pdfIn PDF document text
    • http://yejida.com/userfiles/file/xabogutunalexasatus.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/lekoxatotelamenaxokugazu.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/davuboxapopowajumumonid.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/75099208693.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137ec4b252d7---25179410637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pros+of+rooting+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 17112 bytes
SHA-256: 8b91aad93104212b59a73e78680f47bc1aeee80db7a3361191dbd33cb089acdf
font_01_sfnt_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 10352 bytes
SHA-256: 5b2b033edc004549b6d7c136d095663fc8ed137375a751895d70b9890dce7c16
font_02_sfnt_off0001257c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1